What's in the image? If it's a DVD Video image, mount the image with something like
http://www.dvdfab.com/virtual-drive.htm
and then use the mounted files to create a new build in ImgBurn to get the layer break as you desire.
Try a lower speed than the current 8x.
Those discs with that media code is very often seen as posted "bad burns" in this forum. Try with some better quality media.
Sure you downloaded the latest language file and also unzipped it and put it in the language folder?
If I open up the file in a text reader, the first rows shows this.
You can add 'DVD-R' and it'll burn all DVD-R (that aren't otherwise specified) at whatever speed you select. The same can be done for 'DVD+R'. Just add this text in the DiscID field.
From the source file:
From the german file:
Both have 14 items, so I doubt you have the latest version installed of the german language file.
Microsoft Windows 7 Ultimate x64 Edition (6.1, Build 7601 : Service Pack 1)
Assuming it was a new disc you tried with, the burner can't even read the right size of the discs.
Should be something like this in size.
Not sure why you switched away from SPTI.